CN219037885U - Cylindrical cell expansion detection device - Google Patents
Cylindrical cell expansion detection device Download PDFInfo
- Publication number
- CN219037885U CN219037885U CN202223435464.4U CN202223435464U CN219037885U CN 219037885 U CN219037885 U CN 219037885U CN 202223435464 U CN202223435464 U CN 202223435464U CN 219037885 U CN219037885 U CN 219037885U
- Authority
- CN
- China
- Prior art keywords
- pressure sensor
- bare cell
- film pressure
- device shell
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
Abstract
The utility model discloses a cylindrical cell expansion detection device, which comprises a cylindrical device shell, a bare cell and a plurality of film pressure sensors, wherein the cylindrical device shell is provided with a plurality of holes; the device shell is provided with a closed containing cavity, and electrolyte is filled in the containing cavity; the bare cell is arranged in the accommodating cavity; the thin film pressure sensor is strip-shaped and is distributed on the peripheral surface of the bare cell in a ring-shaped array mode, and a lead of the thin film pressure sensor penetrates out of the device shell; the surfaces of the bare cell and the film pressure sensor are coated with polymer coating layers so that the bare cell and the film pressure sensor are relatively fixed. According to the utility model, the film pressure sensor is arranged in the device shell and is positioned on the peripheral surface of the bare cell, so that the expansion force distribution condition of the bare cell in different directions can be obtained, and the multipoint detection is realized; the embedded film pressure sensor eliminates the interference of the device shell on expansion when the expansion force is detected, directly characterizes the expansion of the bare cell, and obtains more accurate experimental data.
Description
Technical Field
The utility model relates to the technical field of battery safety detection, in particular to a cylindrical cell expansion detection device.
Background
The lithium ion battery has the advantages of high voltage, high specific energy, long cycle life, small self-discharge and the like, and is widely applied to portable electronic equipment, and is more and more popular in large and medium-sized electric and power equipment such as electric automobiles, energy storage power stations and the like. The earliest mass-produced lithium ion battery is 1865 cylindrical battery developed by Sony, which is the first commercial lithium ion battery worldwide and is the most common cylindrical battery model in the market at present. With the further increase of specific energy requirements of electric vehicles on lithium ion batteries, cylindrical batteries with larger volumes, such as 2170 cylindrical batteries and 4680 cylindrical batteries, have been developed. Among them, 4680 cylindrical batteries, which have been recently raised, have been selected as power batteries by many automobile enterprises by virtue of larger volumes, higher energy densities and lower costs. The application scene of lithium ions permeates into aspects of life, so that the performance and safety requirements on the lithium ion battery are higher and higher.
In the cycling process of the lithium ion battery, the anode and cathode materials have structural expansion due to lithium removal and intercalation, and meanwhile, gas production expansion is caused by gas production in the battery. The structural expansion of the electrode material and the gas production expansion of the battery can lead the battery core to generate larger volume deformation, thereby damaging the performance of the battery and causing potential safety hazard of the battery. Along with the circulation, the structural expansion of the electrode material and the gas production pressure of the battery also continuously change, so that two groups of data, namely the structural expansion of the electrode material in the cylindrical battery and the gas production pressure of the battery, are obtained in real time, and the volume expansion of the battery caused by the two forces is distinguished, and the method has important value for the structural strength design of lithium ion batteries, particularly the cylindrical lithium ion batteries, and the improvement of the electrochemical performance and the safety performance of the battery.
Only carry out the correlation technique that outward appearance detected to the cylindrical battery in the current industrial assembly line, still lack the relevant device that can carry out the inflation detection to the cylindrical battery, consequently can only use traditional detection frock to press from both sides tight cylindrical battery and realize the inflation power detection, because the shape of battery and the clamping mechanism who detects the frock are not adapted, can not realize effectual inflation detection, because:
1. the parallel plates of the clamping mechanism are pressed up and down, only the upper end face and the lower end face of the cylindrical battery can be fixed, and the deformation of the cylindrical battery in the actual charging and discharging process is reflected less at the end face position and mainly on the circumferential surface;
2. for the reason in step 1, the existing detection tool only can detect the expansion force of the whole cylindrical battery, and cannot obtain the expansion force distribution conditions in different directions, so that the detection has limitation;
3. on one hand, the aluminum shell of the cylindrical battery can inhibit partial expansion force, on the other hand, a certain gap exists between the bare cell and the aluminum shell, and when the expansion amount of the bare cell is small, the extrusion effect cannot be generated on the aluminum shell, so that the method cannot obtain the real expansion condition of the internal bare cell;
4. the structural and gas production expansion cannot be decoupled.
Disclosure of Invention
The utility model aims to provide a cylindrical cell expansion detection device, which is suitable for cylindrical batteries, and can acquire more accurate expansion force data for experimental study.
In order to achieve the above object, the solution of the present utility model is:
a cylindrical cell expansion detection device comprises a cylindrical device shell, a bare cell and a plurality of film pressure sensors; the device shell is provided with a closed containing cavity, and electrolyte is filled in the containing cavity; the bare cell is arranged in the accommodating cavity; the thin film pressure sensor is strip-shaped and is distributed on the peripheral surface of the bare cell in a ring-shaped array mode, and a lead of the thin film pressure sensor penetrates out of the device shell; and the surfaces of the bare cell and the film pressure sensor are coated with polymer coating layers so that the bare cell and the film pressure sensor are relatively fixed.
The device shell is provided with a communication hole, and an air pressure sensor is arranged at the communication hole.
Preferably, the communication hole is provided on a peripheral surface of the device housing.
Preferably, the air pressure sensor is provided with an air outlet hole, the air outlet hole is communicated with the communication hole, and a screw plug is arranged in the air outlet hole to keep a normally closed state.
The device housing is made of aluminum or a corrosion resistant alloy material.
After the technical scheme is adopted, the utility model has the following technical effects:
(1) the bare cell is arranged in the device shell with the same size as the battery model to be tested, so that the real battery charge and discharge conditions can be simulated;
(2) the film pressure sensor is arranged in the device shell and positioned on the peripheral surface of the bare cell, so that the expansion force distribution condition of the bare cell of the cylindrical battery in different directions can be obtained during experimental detection;
(3) the film pressure sensor arranged in the device shell eliminates the interference of the device shell on expansion when the expansion force is detected, can directly characterize the expansion of the bare cell, is suitable for researching the expansion force of the cylindrical battery at the present stage, and can obtain more accurate experimental data with lower error;
(4) the expansion force data of a plurality of positions can be measured by a plurality of film pressure sensors, the data precision is improved, the design of the plurality of sensors is easy to adapt to bare cells of various sizes, the placement is convenient, the wrinkling phenomenon of the film sensors is not easy to occur, the influence on the detection precision is avoided, and meanwhile, the number of the film sensors can be increased or reduced according to the test requirement.
Drawings
FIG. 1 is a flow chart of an embodiment of the present utility model;
FIG. 2 is an axial cross-sectional view of a first product of the utility model;
FIG. 3 is a radial cross-sectional view of a first product of the utility model;
FIG. 4 is an axial cross-sectional view of a second product of the utility model;
FIG. 5 is a radial cross-sectional view of a second product of the utility model;
FIG. 6 is an axial cross-sectional view of a third product of the utility model;
FIG. 7 is a radial cross-sectional view of a third product of the utility model;
FIG. 8 is an axial cross-sectional view of a fourth product of the present utility model;
FIG. 9 is a radial cross-sectional view of a fourth product of the present utility model;
reference numerals illustrate:
1- - -a device housing; 11- -a communication hole;
2- - -bare cell;
3- -a membrane pressure sensor; 31- - -a wire;
4- - -a polymer coating;
5- -an aluminum plastic film;
6- -locking means; 61- - -a locking body; 62— openings; 63- -a flange; 64-bolt and nut combination;
7- -an air pressure sensor; 71- - -an air outlet; 72- -screw plug;
8- -a polar cap.
Detailed Description
In order to further explain the technical scheme of the utility model, the utility model is explained in detail by specific examples.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Accordingly, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the inventive product is used, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience in describing the embodiments of the present utility model, and is not intended to indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1 to 9, the utility model discloses a processing method of a cylindrical cell expansion detection device and a product thereof.
Referring to fig. 1, the processing method includes the steps of:
step one, preparing a cylindrical device shell 1 with the external dimension consistent with the dimension of the battery model to be tested;
step two, the bare cell 2 is arranged in the device shell 1;
arranging and fixing the film pressure sensor 3 on the peripheral surface of the bare cell 2;
step four, leading the lead wire 31 of the film pressure sensor 3 out of the device shell 1 so as to be connected with a pressure detecting instrument; after the electrolyte is poured into the device case 1, the device case 1 is sealed.
Specific embodiments of the utility model are shown below.
In the first step, the device housing 1 is manufactured by using aluminum or a corrosion-resistant alloy material (such as stainless steel).
In the first step, the battery to be tested is one of 1865 cylindrical batteries, 2170 cylindrical batteries and 4680 cylindrical batteries.
In the second step, the bare cell 2 is a wound battery cell, and its specification parameter is consistent with that of a conventional cylindrical battery, and is one of 1865 cylindrical battery cells, 2170 cylindrical battery cells and 4680 cylindrical battery cells.
In the third step, the membrane pressure sensor 3 is a piezoelectric membrane pressure sensor or a piezoresistive membrane pressure sensor, and the pressure signal is transmitted to the pressure detecting instrument through the wire 31 penetrating out of the device housing 1.
In the third step, the manner for fixing the film pressure sensor 3 may be one of the following:
the film pressure sensor 3 is in a strip shape and is provided with a plurality of film pressure sensors, the film pressure sensors are distributed on the peripheral surface of the bare cell 2 in a ring array mode, polymer slurry is poured into the device shell 1, the polymer slurry is cured by using an initiator to form a polymer wrapping layer 4, and the surfaces of the bare cell 2 and the film pressure sensor 3 are wrapped by the polymer wrapping layer 4, so that the film pressure sensor 3 and the bare cell 2 are relatively fixed; the polymer structure of the polymer coating layer 4 has certain mechanical strength, can resist corrosion of acid, alkali and electrolyte organic solvents, so as to realize that the relative position of the film pressure sensor 3 and the bare cell 2 keeps stable, and transmits the expansion force generated by the bare cell 2 after charge and discharge to the working surface of the film pressure sensor 3.
And (II) arranging the film pressure sensor 3 on the peripheral surface of the bare cell 2 in a circle, and filling polymer slurry into the device shell 1, wherein the polymer slurry is cured by using an initiator to form a polymer coating layer 4 to cover the surface of the film pressure sensor 3, so that the film pressure sensor 3 and the bare cell 2 are relatively fixed.
And thirdly, arranging the film pressure sensor 3 on the peripheral surface of the bare cell 2 in a circle, and coating the aluminum plastic film 5 on the peripheral surface of the film pressure sensor 3 so as to enable the film pressure sensor 3 and the bare cell 2 to be relatively fixed.
Fourthly, the film pressure sensor 3 is arranged on the peripheral surface of the bare cell 2 in a circle, and then the locking device 6 is used for locking around the peripheral surface of the film pressure sensor 3, so that the film pressure sensor 3 and the bare cell 2 are relatively fixed. The locking device 6 is a device with annular locking function, such as a locking ring, and is preferably made of a corrosion-resistant material.
Further, in the above-described mode (one) (two), the initiator is a heat, light or specific chemical initiator.
Between the third and fourth steps, a communication hole 11 may be formed in the device housing 1, and an air pressure sensor 7 may be installed at the communication hole 11, where a pressure collecting hole (conventional structure, not shown) of the air pressure sensor 7 is connected to the inside of the device housing 1 through the communication hole 11 to measure the air pressure of the battery. By installing the air pressure sensor 7 on the detection device, two groups of key data of the structural expansion and the gas production expansion of the cylindrical battery can be obtained in real time in the charge-discharge cycle process, and the structural expansion and the gas production expansion of the cylindrical battery can be decoupled.
Further, an air outlet hole 71 may be provided in the air pressure sensor 7. When only the internal air pressure of the battery needs to be measured, the air outlet hole 71 can be closed by the screw plug 72; when the gas composition inside the battery needs to be measured, the screw plug 72 is pulled out, and the gas outlet hole 71 can be connected to a gas chromatograph or a gas mass spectrometer through a gas pipe, so that the gas production of the cylindrical battery can be analyzed and studied more deeply.
By the above processing method, an expansion detection device including a cylindrical device case 1, a bare cell 2, and a film pressure sensor 3 can be obtained;
the device shell 1 is provided with a closed containing cavity, and electrolyte is filled in the containing cavity;
the bare cell 2 is arranged in the accommodating cavity;
the film pressure sensor 3 is fixedly matched on the peripheral surface of the bare cell 2, and a lead 31 of the film pressure sensor penetrates out of the device shell 1 so as to be connected with a pressure detecting instrument.
In some embodiments of the expansion detecting device, the device case 1 is provided with a communication hole 11, and the air pressure sensor 7 is mounted to the communication hole 11.
Further, the air pressure sensor 7 is provided with an air outlet hole 71, the air outlet hole 71 communicates with the communication hole 11, and a screw plug 72 is provided in the air outlet hole 71 to maintain a normally closed state.
In some embodiments of the expansion detection device, the device housing 1 is made of aluminum or a corrosion resistant alloy material, wherein the corrosion resistant alloy material may be stainless steel.
Referring to fig. 2 and 3, a first product of the utility model is shown:
the thin film pressure sensors 3 are strip-shaped and are provided with a plurality of thin film pressure sensors 3, the thin film pressure sensors 3 are distributed on the peripheral surface of the bare cell 2 in a ring-shaped array mode, and the surfaces of the bare cell 2 and the thin film pressure sensors 3 are coated with the polymer coating layer 4 so as to realize the fixed fit of the thin film pressure sensors 3 and the bare cell 2.
The communication hole 11 is provided on the peripheral surface of the device case 1.
The lead wire 31 of the film pressure sensor 3 is inserted through the gap between the device case 1 and the pole ear cap 8.
Referring to fig. 4 and 5, a second product of the utility model is shown:
the film pressure sensor 3 is wound on the peripheral surface of the bare cell 2 and connected into a circle, and the surface of the film pressure sensor 3 is coated with a polymer coating layer 4 so as to realize the fixed fit of the film pressure sensor 3 and the bare cell 2.
The communication hole 11 is provided on the peripheral surface of the device case 1.
The lead wire 31 of the film pressure sensor 3 is inserted through the gap between the device case 1 and the pole ear cap 8.
Referring to fig. 6 and 7, a third product of the present utility model is shown:
the film pressure sensor 3 is wound on the peripheral surface of the bare cell 2 and connected into a circle, and the surface of the film pressure sensor 3 is coated with an aluminum plastic film 5 so as to realize the fixed fit of the film pressure sensor 3 and the bare cell 2.
The communication hole 11 is provided on an end face of the device case 1.
The lead wire 31 of the above-mentioned film pressure sensor 3 is passed out from the hole of the device case 1 and seals the hole.
Referring to fig. 8 and 9, a fourth product of the present utility model is shown:
the film pressure sensor 3 is wound on the peripheral surface of the bare cell 2 and connected into a circle, and a locking device 6 is arranged on the surface of the film pressure sensor 3 so as to realize the fixed fit of the film pressure sensor 3 and the bare cell 2; the locking device 6 comprises a cylindrical locking body 61, an axially extending opening 62 is arranged on the peripheral surface of the locking body 61, flanges 63 are formed on two sides of the opening 62 in an outward protruding mode, and a plurality of bolt and nut combinations 64 are adopted between the two flanges 63 for locking.
The communication hole 11 is provided on an end face of the device case 1.
The lead wire 31 of the above-mentioned film pressure sensor 3 is passed out from the hole of the device case 1 and seals the hole.
Through the scheme, the bare cell 2 is arranged in the device shell 1 with the same size as the battery model to be tested, so that the real battery charge and discharge conditions can be simulated; the film pressure sensor 3 is arranged in the device shell 1 and positioned on the peripheral surface of the bare cell 2, so that the expansion force distribution condition of the bare cell 2 of the cylindrical battery in different directions can be obtained during experimental detection; the film pressure sensor 3 arranged in the device shell 1 eliminates the interference of the device shell 1 on expansion when the expansion force is detected, can directly characterize the expansion of the bare cell 2, is suitable for researching the expansion force of a cylindrical battery at the present stage, and can obtain more accurate experimental data with lower error.
The above examples and drawings are not intended to limit the form or form of the present utility model, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present utility model.
Claims (5)
1. The utility model provides a cylinder electricity core inflation detection device which characterized in that:
comprises a cylindrical device shell, a bare cell and a plurality of film pressure sensors;
the device shell is provided with a closed containing cavity, and electrolyte is filled in the containing cavity;
the bare cell is arranged in the accommodating cavity;
the thin film pressure sensor is strip-shaped and is distributed on the peripheral surface of the bare cell in a ring-shaped array mode, and a lead of the thin film pressure sensor penetrates out of the device shell;
and the surfaces of the bare cell and the film pressure sensor are coated with polymer coating layers so that the bare cell and the film pressure sensor are relatively fixed.
2. The cylindrical cell expansion detection device of claim 1, wherein:
the device shell is provided with a communication hole, and an air pressure sensor is arranged at the communication hole.
3. The cylindrical cell expansion detection device according to claim 2, wherein:
the communication hole is provided on a peripheral surface of the device housing.
4. The cylindrical cell expansion detection device according to claim 2, wherein:
the air pressure sensor is provided with an air outlet hole, the air outlet hole is communicated with the communication hole, and a screw plug is arranged in the air outlet hole to keep a normally closed state.
5. The cylindrical cell expansion detection device of claim 1, wherein:
the device housing is made of aluminum or a corrosion resistant alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223435464.4U CN219037885U (en) | 2022-12-21 | 2022-12-21 | Cylindrical cell expansion detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223435464.4U CN219037885U (en) | 2022-12-21 | 2022-12-21 | Cylindrical cell expansion detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219037885U true CN219037885U (en) | 2023-05-16 |
Family
ID=86316086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223435464.4U Active CN219037885U (en) | 2022-12-21 | 2022-12-21 | Cylindrical cell expansion detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219037885U (en) |
-
2022
- 2022-12-21 CN CN202223435464.4U patent/CN219037885U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4322282A1 (en) | Three-electrode cell structure and preparation method therefor, and method for testing negative electrode potential | |
| CN209991940U (en) | Battery pole piece thickness variation measuring device and system | |
| CN112557931B (en) | Device and method for detecting health degree of metal lithium battery | |
| CN112350003A (en) | Single battery and expansion testing method thereof | |
| CN102331560A (en) | Method for estimating state of charge of nickel-metal hydride battery | |
| CN217641491U (en) | Battery with built-in information acquisition and wireless transmission | |
| CN111697280A (en) | Battery device capable of monitoring electrode stress change in real time, battery adopting device and application of device | |
| CN211088434U (en) | Three-electrode battery | |
| CN111129432A (en) | Novel reference electrode and three-electrode system for nondestructive testing of lithium ion battery industry and method | |
| CN111063939A (en) | Three-electrode battery and preparation method thereof | |
| CN219037885U (en) | Cylindrical cell expansion detection device | |
| CN207868299U (en) | A kind of battery with temperature sensor | |
| CN219038234U (en) | Expansion detection device of cylindrical battery cell | |
| CN113418651A (en) | Method and structure for detecting internal pressure of lithium ion power battery based on piezoelectric sensing | |
| CN113644329A (en) | Reference electrode, three-electrode battery and manufacturing method thereof | |
| CN116086659A (en) | Processing method of cylindrical cell expansion detection device | |
| CN114114043B (en) | Expansion detection method in lithium battery cycle process | |
| CN116207357A (en) | Three-electrode cell structure, three-electrode battery and negative electrode potential monitoring method | |
| CN116087778A (en) | Self-adaptive battery expansion detection method | |
| CN111239622B (en) | Method for in-situ determination of irreversible energy of positive and negative electrodes of lithium ion battery | |
| CN110208711B (en) | Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery | |
| CN219066917U (en) | Battery provided with sandwich reference electrode, reference electrode and electricity utilization device | |
| CN111679217A (en) | Battery early warning method and device adopting coulomb efficiency in SOC (System on chip) interval | |
| CN206282943U (en) | Inside battery pressure detector arrangement | |
| CN219349082U (en) | Battery expansion force testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |